Duplex projection



11.11526, 1932- A. D. Errzr-:N 1,868,889

DUPLEX PROJECTION Filed March 2e. 1929 INVENTOR z v ATTORNEY l Patented July `26, 1932 UNITED STATES PATENT OFFICE AUGUST D.' EITZEN, OF NEW YORK, N. Y., ASSIGNOR TO NEWS PROJECTION CORPORA- TION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK DUPLEX PROJECTION application mea maren 2e, 192s. serial' No. 350,113.

My present invention relates generally to stock ticker projecting machines, and has particular reference to the mounting of such machines in ,connection with ythe ,display yscreens cooperating therewith.

A particular object of'my present invention is to provide an improved projecting machine and mounting means therefor, whereby images are produced upon more than one screen at one time. For example, where the markings onone ticker tape relate to the transactions of one particular market, and where a second ticker tape bears indications of transactions in a different market, it is frequently desirable to renderboth tapes visible in a relatively large and displayed manner. Thus, in New York city, a pair of screens commanding a. articular observation area may be employe for displaying stock market and curb market transactions.

A more 'specific object of my invention is to provide mountin means for the projecting devices and their appurtenant. parts whereby the plurality of screens may be most efficiently arranged in maximum proximity to each other, and whereby the entire supporting structure, such asa suitable housing, may be rendered more compact and attractive. V

My construction contemplates the employment of two projecting devices, each of which includes a source of light adapted to project a beam of light through a marked ticker tape passing therethrough', and it is an' object of.

my invention to provlde means for creating images on the plurality of screens," whichv images bear a predetermined size relationship-to each other. For example, it may be desirable in certain cases to have the images on all screens identical in size; in other cases,

it may be most satisfactory to have the uppermost screen display'an image of slightly greater size because of its greater distance from the observers.

In general, it is an object to provide at least two lprojecting devices in association with at least two preferably superposed vertical screens, and means for transmitting the beams of light from the projecting devices onto the screensin a manner which fully takes into account the most eflicient mounting and mutual arrangement of the rojecting devices and the possible inequa ities of the distances through which the two beams must pass.

For the attainment of the foregoing objects and such other objects as may hereinafter appear or be pointed out, I have illustrated one form of my invention in the accompanying drawing wherein- Figure 1\ is an elevational cross-section through a structure embodying the features of my invention;

Figure 2 is a view taken from the right of the upper portion of Figure 1; and Figure 3 is a diagrammatic view on a greatly reduced scale of one of the projecting devices of Figure 1 asl viewed from the right thereof. f

In the embodiment herein chosen vfor illustration and description I have shown a housing provided with the front vertical .wall 11 in the upper portion of which'a pair of superposed display screens 12 andi13 are arranged. AThese screens have been shown of equal size as illustrated in Figure 2 and the 'attractive proximity thereof, resulting 1n general compactness and inexpensiveness of manufacture, is clearly depicted in Figure 2.

Mounted in the housing and behind the front wall 11 I have shown two/projecting devices 14 and 15, the latter being further to the rear of the wall 11 than the ormer. In

the illustrated embodiment, the projecting device 15 is mounted higher than theaevice A:ss

illustrated in Figure 3. If, for example the projecting device of Figure 3 be that which is designated by thereference numeral 15 in Figure 1, then it is associatedwith a stock ticker 17 adapted to discharge a marked tape 18, the latter being directed through the projecting device 15 and thence to a suitable take-up or rewinding mechanism 19.

Each of thewprojecting devices includesl a source of light "tnot shown in the drawing) adapted to project a beam of light upwardly through the tape passing therethrough. I have shown a beam of light of this character, 20, emanating from the projecting device 15; and I have shown a similar beam o'f light 21 thrown upwardly from the projecting device It is to be noted that the beams 20 and 21 are directed in substantially parallel vertical directions. j

In the path of each upwardly projected beam I interpose suitable reflecting means for transmitting the beam in a substantially perpendiculary direction onto the rear of one of the screens on the front wall 11. For example, I have shown a mirror or reflecting member 22 interposed in the path of the rear beam 20, the mirror 22 being inclined upwardly and rearwardly so as to reflect the beam downwardly and rearwardly'toward a second mirror or reflecting member 23. The latter is inclined upwardly andrearwardly but at a greater angle to the horizontal, whereby it serves to receive the reflected rays from the mirror 22 and to re-reflect the latter in a substantially horizontal and forward direction onto the rear of the screen 12. The mirrors 2,2 and 23 are preferably disposed at an angle of substantially 45 to each other and are suitably mounted or supported by a device 25 ixedly associated with the housing 10, as b means of the upwardly extending tie mem ers 26. n

A similar pair of mirrors 27 and28 has been shown interposed in the path of the upwardly projected beam 21, these mirrors being carried a supporting device 29 which is attached to the front wall 11. To accommodate the upper 'portion of the mirror 27 in an eiici ent and compact manner, I have provided a recess 30 in the upper wall of the housing l0.

It is obvious that the lower border of each image lies substantially on a horizontal plane with the lower yedge of the second refiecting member from which such image emanates. Thus, the lower border of the image on the screen 12 is substantially aligned horizontally with the lower edge of the mirror 23, and the kSallie is true with respect to the lower edge of the image produced on the screen 13, the latter lower edge being substantially aligned horizontally with the lower edge of the mirror 28. It is also to be observed .nat the upper border of each image is similarly aligned be substantially equal in size.

upper border of the image on the screen 13 lies substantially lower than the upper edge of the mirror 27. Accordingly, in carrying out my invention, particularly with respect to the compactness aimed at, I have fully taken into account the foregoing relationships of image borders and mirror edges, and I have-mounted the mirror pair 22-23 below the mirror pair 27-28. This arrangement permits me to mount the screens 12 and 13 in minimum proximity to each other. If, for example, the mirror pair 22-23 were positioned behind the screen 13, and the mirror pair 27-28 were positioned behind the screen 12, the screens 12 and 13 would have to be further apart so that the horizontal beam leading from the mirror 23 to the screen would be allowed to clear the upper edge of the mirror 27.

The foregoing relative mounting and arrangement of the two mirror pairs illustrated has a further advantage and carries into effect a further object of my invention in the light of the unequal distances through which the two light beamstravel. Thus, since the projecting device 15 is further from the wall 11 than the projecting device 14, it follows that the horizontal component of beam travel from the device 15 will be longer than the horizontal component of beam travel from the device 14. In an effort to compensate for this, and to equalize the total travels of the beams, the mirror set interposed in the path of the rear beam 20 is positioned lower than the other mirror set, as shown, so that the vertical component of travel of the beam 20 will be somewhat less than the vertical component of travel of the beam 21.

Where the projecting devices are arranged one behind the other, as shown, but on a substantially horizontal plane with respect to each other, the relative arrangement of the mirror pairs in accordance with the foregoing description will satisfactorily equalize the total travels of the two beams, so that if the projecting devices are otherwise the same, the images produced on the two screens will By raising one of the projecting devices with respect to the other, as shown in Figure 1 wherein the projecting device 15 is higher, the relative sizes of the images on the two screens may be varied in accordancewith requirements.

In the illustrated embodiment, I have shown the possible combination with the foregoing control of size relationship, of a further means for controlling the relative sizes of the images.` I have shown an objective lens 31 in the path of the beam 20, and @Il objective lens 32 in the path of the beam 21. If these objective lenses were identical, or if. they were omitted, the stepped mounting ofv the projecting devices '14 and 15 would cause the image on the screen 13 to be larger than the image on the screen 12. As an illustration of the manner in which this etticient stepped mounti-ng of the projecting devices may be resorted to while at the same time controlling the image sizes to render them substantially equal, I have rovded the objective lens 31 of a shorter ocal length, say, 5.5 inches, than the focal length of the objective lens 32, which may be, for example, 6.5 inches. This variation of focal lengths results in different divergences of the beam whereby the image on the screen 12 may be rendered equal in size to that on the screen 13.

It will be obvious that wherel the projecting devices are mounted on the same plane,

or in a less steppedv relationship than that illustrated, then the provision of objective i lenses of different focal lengths may still be resorted to to accomplish a desired and redetermined control of size relationship of images. y

In general, it will be observed that I have provided a construction which is extremely A simple and which serves to fulfill the contemplated function in an e'fiicient and easily controllable manner. The structure illustrated by way of example is extremely compact and attractive in appearance. A minimum of parts are employed, and a pair of images of equal sizes are produced in an eilicient manner upon a pair of closely adjacent equally sized screens. `i

It will be obvious that changes in the details herein described and illustrated for the purpose of explaining the nature 'of my invention may be made by those skilled in the art without departing from the spirit and scopel of the invention as expressed in the appended claims. It is therefore intended that these details be interpreted as illustrative, and not in a limiting sense.

Having thus described Iny invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is- 1. The combination with a housing having a wall, of a pair of display screens one above the other in said wall, a projecting 'device 1n said housing, a second projecting device in said housing between said wall and said first proj ecting` device, each of said projecting devices including a light source adapted to project a beam of light in a direction substantlally parallel to said wall, a reflecting means for transmitting the light beams from said first projecting device in substantially perpendicular directions onto said lower screen, and a second reiiecting' means for transmitting the light beams from said sec-- ond projecting device in substantially perpendicular directions onto said upper screen whereby the distances traversed by the light b eams to said screens may be made substantlally equal, said second reecting means ex-A tending up partly into the top of said housing and the upper portion of said first remecting means extending up above the lower edge of said second reflecting means.

2. The combination with a housing having a wall, of a pair of display screens one above the other in said wall, a projecting device in said housing, a second projecting device iny said housing between said wall and said first projecting device, each of said projecting devices including a light source adapted to project a beam oflight in a direction substantially parallel to said wall, a reflecting device for transmitting the light beams from said first projecting device in substantially perpendicular directions onto said lower screen; a second reflecting device disposed at a higher level than said first refiecting vmeans for transmittin vthe light beams from said second projecting device in substantially perpendicular directions onto said upper screen, said second refiecting device extending up partly into the top of said housing and the upper portion of said rst reflecting device extendlng up above the lower edge of said second reiecting device.

3. The combination with a housing having a wall, of a pair of display screens one above the other in said- Wall, a projecting device in said housing, a second projecting device in said housing between said wall and said first projecting device, each of said projecting devices including a light source adapted to project a beam of light in a direction substantially parallel to said wall, a reflecting device having an upper mirror and a lower mirror, the upper mirror receiving the light beams from said first projecting device' and reflectin g them onto said lower mirror, the lower mirror refiecting the light beams so rece' ed onto said lower screen, and a second reflecting device disposed at a higher level than said first reflecting device and valso having an upper mirror and a lower mirror, the upper mirror of said second reflecting device receiving the light beams from said second projecting device and reflecting them onto the lower mirror of said second reflecting device and the y lower mirror of said second reflecting'devioe first projecting device, each of said projecting devlces including a light source adapted to project a beam of light in a direction substantially parallel to said wall, a reflecting device having an upper mirror and a lower mirror, the upper mirror receiving the light beams from said first projecting device and reflecting them onto said lower mirror, the lower mirror reflecting the light beams so received onto said lower screen, a second reflecting device disposed at a higher level than said first reflecting device and also having an upper mirror and a lower mirror, the upper mirror of said second reflecting device extending up partly into the top of the housing and receiving the light beams from said second projecting device and reflecting them onto the lower mirror of said second reflecting device andthe lower mirror of said second reflecting device reflecting the light beams so received onto said upper screen, the upper portion of said first reflecting device extending up beyond the lower edge of said second reflecting device, and optical means for each projecting device, each optical means having objective lenses of a focal length to correspond to the distances traversed by the light beam received to rendei\ the images on said screens of predetermined relative size.

5. The combination witha housing having a wall, of a pair of display screens one disposed longitudinallyv along the upper end of said wall, the other disposed longitudinally directly below said first mentioned screen, a

projecting device in said housing, a second projecting device in said housing and between said wall and said first projecting device, said projecting devices and wall being compactly disposed adjacent to one another, each of said projecting devices including a light source adapted to project a beam of light in a direction substantially parallel to said wall, a reflecting device suspended from the top of said housing directly above said first projecting device and having an upper mirror and a. lower mirror, the upper mirror receiving the light beams from said first projecting device and reflecting them onto said lower mirror, the lower mirror reflecting the light beams so received onto said lower screen, a second refleeting device disposed adjacent to the upper screen at a higher level than the level of said first reflecting device and also having an upper mirror and a lower mirror, the upper mirror of said second reflecting device extending` up partly into the top of the housing and receiving the light beams from said second projecting device and reflecting them onto the lower mirror of said second reflectin device and the lower mirror of said secon reflecting device reflecting the light beams so received onto said upper screen, the upper portion of said first reflecting device extending up lbeyond the level of the lower edge of the second reflecting device to form a compact arrangement in a vertical directionand optical means for said projecting devices relative size.

AUGUST D. EITZEN. 

